In-room imaging and MR planning

Gradient echo

1− − ൗ 1

−

ൗ

S ~ sin

2∗

ൗ − 1

1−cos

Small angle - reduces T1 weighting and yielding proton density weighting Large flip - yields T1 weighting Short TR - increases T2* weighting (residual transverse magnetization is dominant) Long TR - enhances T1 weighting Short TE - reduces T2* weighting and increases T1 or PD weighting Long TE - enhances T2* weighting

= cos −1 − ൗ 1